Grind the biscuits. Take a bowl, to that add the grinded biscuits, now add 2 tbsp of powdered sugar. Now gradually add the milk as required and make a paste as shown in the 3rd photo.

Now to the batter add 2 tbsp of melted butter. Mix it well. Now add 1/4 cup of chopped walnuts. Add a tsp of vanilla essence to it. Just before baking add a tsp of baking powder.

Take a cake tin, grease it with some oil. Now add the prepared batter to it. Bake the cake at preheated oven for 30 - 40 minutes.

After 30 minutes insert a toothpick in the cake and if it comes out clean the cake is perfectly baked.

If you want decorate the cake with removed cream of oreos in your way.

The walnut Brownie cake is ready, you can make sizzling Brownie, walnut mousse or anything or eating just like that. It is a best evening snack. Enjoy the Brownie cake